Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

Wazuh - Open Source Host and Endpoint Security

tcpdump - tcpdump is a common packet analyzer that runs under the command line.

Beats - Beats is the platform for single-purpose data shippers that is installed as lightweight agents and send data to machines to Logstash or Elasticsearch.

SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.

Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.